Vox AC 30 Output ??

[nessmonst]

I've often read that the actual output of the AC30 is in the region of 120watts (not 30w).
Interested to know if this is actually the case and if so does that mean that the AC15 would have a comparable output of 60watts?
Regards
David

[baz]

I would think what you've read is the suggestion that a 30 watt valve amp can be as "loud" as a much higher rated solid state amp.

Baz

[Steve Reynolds]

The speakers on an AC30 are 15w each so total of 30watt.

Im not sure how it works but i know a 100w Solid State amp is probably only as loud as a 20w valve amp.

[Charlie Hall]

The output power is measured with a dummy load resistor, not a speaker. The output is around 30 watts, Vox have claimed 33 watts with some versions. The earliest ones were nearer to 24 watts.
Valve amps have a higher output impedance than most solid state amps. This causes a big difference in the perceived power when a speaker is connected. The valve amp will seem more powerful. AC30 amps are particularly loud because the Blue speakers are very efficient.
Regards,
Charlie

[ALopez46]

Hi

The power of 30 watts tube amplifiers is the same as transistor amplifiers if we use the same measurement system (dummy load).
The confusion comes when we speak of RMS power, active power, power consumption, Music Power, etc. without specifying it.

The valves have high output impedance but it is reduced by the output transformer to the speaker impedance (usually 4 Ohm or 8 Ohm).

Antonio

[Charlie Hall]

I don't think you understand at all. The output to the speaker from the output transformer secondary is higher impedance than the output of a transistor amp to a speaker, unless the transistor amp output is artificially raised by using current feedback. This is what solid state output amps like the Marshall Valvestate power amps do.

[ALopez46]

I do not want to get into discussions. I say only what I say.
I've been exercising my profession for 50 years (since the metal valve to the microprocessor).
If we talk about taste, nuances, tone color, saturation, etc. that is another issue, but 1 watt gives the same sound pressure as produce transistors or valves whenever the speaker performance is the same in both cases.

Antonio

[Charlie Hall]

If you are not prepared to discuss then stay out of it and stop spreading misinformation.
For those who care:
education.lenardaudio.com/en/14_valve_amps_7.html

[ALopez46]

I'm not spreading misinformation. Respect please.

I only appeal to the Laws of Physics.

Power = V x I
1 Watt = 1V x 1A (Watt, volt and amp without surnames of transistor or valves)

As you say I'm misinforming, Can you tell me how many watts of solid state amplifier I have to put to match a tube amplifier 30 watts ?.

So we began discussing whether weighs more a kilo iron than a kg of lead or a Kg of air or a Kg of straw?

I am sorry. You follow with the subject. I have no more to say.
Chao, Chao

[Deleted]

Just dropped on this one...getting a little bit silly maybe?......I think that amp output in watts & perceived actual volume of sound is probably one of the most misunderstood subjects in the Musician's world......Jack Darr's Guitar Amplifier Handbook is a good read for those wanting to get more insight......not available in print now, except at inflated second hand book prices, but is available as a free download via a Google search.......I bought the book in the 60's when I was doing my HNC with Post Office Telephones and found it most interesting.....
Paul.....

[Charlie Hall]

The laws of physics have nothing to do with the way power is transferred to the speaker.
I have been doing this for more than 50 years too. One of the first books I bought was the Jack Darr one and I still have it. It explains nothing about the differences between valve and solid state amps.
I agree that it is getting silly. I am now locking this thread.